metamaps--metamaps/app/services/map_export_service.rb

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class MapExportService < Struct.new(:user, :map)
def json
# marshal_dump turns OpenStruct into a Hash
{
topics: exportable_topics.map(&:marshal_dump),
synapses: exportable_synapses.map(&:marshal_dump)
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}
end
def csv(options = {})
CSV.generate(options) do |csv|
to_spreadsheet.each do |line|
csv << line
end
end
end
def xls
to_spreadsheet
end
private
def topic_headings
[:id, :name, :metacode, :x, :y, :description, :link, :user, :permission]
end
def synapse_headings
[:topic1, :topic2, :category, :description, :user, :permission]
end
def exportable_topics
visible_topics ||= Pundit.policy_scope!(user, map.topics)
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topic_mappings = Mapping.includes(mappable: [:metacode, :user])
.where(mappable: visible_topics, map: map)
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topic_mappings.map do |mapping|
topic = mapping.mappable
OpenStruct.new(
id: topic.id,
name: topic.name,
metacode: topic.metacode.name,
x: mapping.xloc,
y: mapping.yloc,
description: topic.desc,
link: topic.link,
user: topic.user.name,
permission: topic.permission
)
end
end
def exportable_synapses
visible_synapses = Pundit.policy_scope!(user, map.synapses)
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visible_synapses.map do |synapse|
OpenStruct.new(
topic1: synapse.node1_id,
topic2: synapse.node2_id,
category: synapse.category,
description: synapse.desc,
user: synapse.user.name,
permission: synapse.permission
)
end
end
def to_spreadsheet
spreadsheet = []
spreadsheet << ["Topics"]
spreadsheet << topic_headings.map(&:capitalize)
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exportable_topics.each do |topics|
# convert exportable_topics into an array of arrays
spreadsheet << topic_headings.map { |h| topics.send(h) }
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end
spreadsheet << []
spreadsheet << ["Synapses"]
spreadsheet << synapse_headings.map(&:capitalize)
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exportable_synapses.each do |synapse|
# convert exportable_synapses into an array of arrays
spreadsheet << synapse_headings.map { |h| synapse.send(h) }
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end
spreadsheet
end
end